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A swimmer can swim with velocity of 12 km/h in still water. Water flowing in a river has velocity 6km/h. The direction with respect to the direction of flow of river water he should swim in order to reach the point on the other bank just opposite to his starting point is __________ $°$ . ( GIVE ANSWER IN DEGREE)

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answer is 120.

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Detailed Solution

For reching just opposite end, $12 \sin θ = v_{r}$
$\sin θ = \frac{1}{2} \Rightarrow θ = 30^{0}$
$∴ α = 120^{0}$

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